问题 选择题

英国《新科学家(New Scientist)》杂志评选出了2008年度世界8项科学之最,在XTEJ1650-500双星系统中发现的最小黑洞位列其中,若某黑洞的半径R约45km,质量M和半径R的关系满足(其中为光速,为引力常量),则该黑洞表面重力加速度的数量级为

A.1010 m/s2

B.1012 m/s2

C. 1011 m/s2

D.1013 m/s2

答案

答案:B

题目分析:据题意,由于已知黑洞的半径R和黑洞质量与半径关系为:,据万有引力等于重力,即:,带入数据可以求得该黑洞表面的重力加速度为:,故选项B正确。

阅读理解

阅读理解

       Singers, actors, painters and many other famous people all have to face(面对) the dangers of fame. Wherever they go, people turn up to greet them. Some fans even do something crazy just to see their

well-known face, touch their clothes or see their smile.The stars are always surrounded by newspapermen, TV reporters and photographers.

       Fame brings them quite a lot of money, so they can have easier lives than other people. They live in

beautiful houses with house keeps, gardeners and cooks, but money doesn't bring them happiness. The

next thing is stress. The more money they get, the more stress they feel.  Being stressed for long makes

many of them sick.  In other words, fame can make a man happy, but it can also destroy him. There are

also some famous people that have quiet lives without any serious problems. It depends on the person.

1. According to the passage, some fans of famous people do crazy things to ______.

    ①look at their well-known face       ②touch their clothes

    ③see their smile                              ④sing their songs                            

A. ①③④        

B. ①②④      

C. ①②③    

D. ②③④

2. What does the underlined word "surrounded" mean in Chinese?

A. 围绕    

B. 拥抱    

C. 袭击    

D. 伤害

3. Famous people can easily get all the things EXCEPT_______.

A. much money            

B. happiness

C. comfortable lives          

D. beautiful houses

4. Which of the following is NOT true according to the passage?

A. Famous people are usually rich.

B. Not all famous 'people live happily.

C. Some famous people get sick because of stress.

D. It is impossible for famous people to have a quiet life.

5. What does the writer think of fame?

A. Fame is bad for your health.

B. Fame can make one's life better.

C. Fame can always make a man happy.

D. Fame can make a man happy, but it can also destroy him.

多项选择题